wwh@cms:~$ sudo dmesg | grep vda
[ 0.620525] vda: vda1 vda2 < vda5 >
[ 1.331007] EXT4-fs (vda1): mounting ext2 file system using the ext4 subsystem
[ 1.334246] EXT4-fs (vda1): mounted filesystem without journal. Opts: (null)
wwh@cms:~$ sudo fdisk -l /dev/vda | grep ^/dev
/dev/vda1 * 2048 499711 497664 243M 83 Linux
/dev/vda2 501758 41940991 41439234 19.8G 5 Extended
/dev/vda5 501760 41940991 41439232 19.8G 8e Linux LVM
wwh@cms:~$ sudo parted /dev/vda
GNU Parted 3.2
Using /dev/vda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: Virtio Block Device (virtblk)
Disk /dev/vda: 236GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 1049kB 256MB 255MB primary ext2 boot
2 257MB 21.5GB 21.2GB extended
5 257MB 21.5GB 21.2GB logical lvm
(parted) resizepart 5 100%
Error: Can't have overlapping partitions.
此錯誤是因2是擴充詞區，5是邏輯磁碟，所以需要先擴充2，再擴充5。
(parted) print
Model: Virtio Block Device (virtblk)
Disk /dev/vda: 236GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 1049kB 256MB 255MB primary ext2 boot
2 257MB 21.5GB 21.2GB extended
5 257MB 21.5GB 21.2GB logical lvm
(parted) resizepart 2 100%
(parted) resizepart 5 100%
(parted) quit
Information: You may need to update /etc/fstab.
wwh@cms:~$ sudo fdisk -l /dev/vda | grep ^/dev
/dev/vda1 * 2048 499711 497664 243M 83 Linux
/dev/vda2 501758 461373439 460871682 219.8G 5 Extended
/dev/vda5 501760 461373439 460871680 219.8G 8e Linux LVM
wwh@cms:~$ sudo pvresize /dev/vda5
wwh@web:~$ sudo pvresize /dev/vda5
Physical volume "/dev/vda5" changed
1 physical volume(s) resized / 0 physical volume(s) not resized
參考資料：https://pve.proxmox.com/wiki/Resize_disks
但是這樣還是沒有變大？？
wwh@cms:~$ sudo pvs
[sudo] password for wwh:
PV VG Fmt Attr PSize PFree
/dev/vda5 D8-vg lvm2 a-- 219.76g 200.00g
wwh@cms:~$ sudo vgs
VG #PV #LV #SN Attr VSize VFree
D8-vg 1 2 0 wz--n- 219.76g 200.00g
wwh@cms:~$ sudo lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root D8-vg -wi-ao---- 18.91g
swap_1 D8-vg -wi-ao---- 872.00m
wwh@cms:~$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/dm-0 19G 967M 17G 6% /
udev 10M 0 10M 0% /dev
tmpfs 794M 8.4M 785M 2% /run
tmpfs 2.0G 0 2.0G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
/dev/vda1 236M 33M 191M 15% /boot
wwh@cms:~$ sudo fdisk -l /dev/vda | grep ^/dev
/dev/vda1 * 2048 499711 497664 243M 83 Linux
/dev/vda2 501758 461373439 460871682 219.8G 5 Extended
/dev/vda5 501760 461373439 460871680 219.8G 8e Linux LVM
--------這一段是錯誤示範（是我不會作亂弄的）------------------------------------------------------------
wwh@cms:~$ sudo lvresize -L+200G --resizefs /dev/dm-0
Path required for Logical Volume "dm-0"
Please provide a volume group name
Run `lvresize --help' for more information.
wwh@cms:~$ sudo lvresize -L+200G --resizefs /dev/vda2
Path required for Logical Volume "vda2"
Please provide a volume group name
Run `lvresize --help' for more information.
所以既不是dm-0 也不是vda2
-------- 這一段是錯誤示範 ------------------------------------------------------------
那到底是？？
wwh@cms:~$ sudo pvdisplay
--- Physical volume ---
PV Name /dev/vda5
VG Name D8-vg
PV Size 219.76 GiB / not usable 2.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 56258
Free PE 51200
Allocated PE 5058
PV UUID cC963w-****-****-****-PMdI-VPpH-McB99G
wwh@cms:~$ sudo vgdisplay | grep Name
VG Name D8-vg
wwh@cms:~$ sudo lvdisplay | grep Path
LV Path /dev/D8-vg/root
LV Path /dev/D8-vg/swap_1
終於找到正確的 LV Path
Size of logical volume D8-vg/root changed from 18.91 GiB (4840 extents) to 218.91 GiB (56040 extents).
Logical volume root successfully resized
wwh@cms:~$ sudo resize2fs /dev/D8-vg/root
resize2fs 1.42.12 (29-Aug-2014)
Filesystem at /dev/D8-vg/root is mounted on /; on-line resizing required
old_desc_blocks = 2, new_desc_blocks = 14
The filesystem on /dev/D8-vg/root is now 57384960 (4k) blocks long.
wwh@cms:~$ df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/dm-0 216G 982M 206G 1% /
udev 10M 0 10M 0% /dev
tmpfs 794M 8.4M 785M 2% /run
tmpfs 2.0G 0 2.0G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
/dev/vda1 236M 33M 191M 15% /boot
終於弄對了！！
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